CN109758624B - High-reliability negative pressure regulator - Google Patents
High-reliability negative pressure regulator Download PDFInfo
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- CN109758624B CN109758624B CN201811647313.0A CN201811647313A CN109758624B CN 109758624 B CN109758624 B CN 109758624B CN 201811647313 A CN201811647313 A CN 201811647313A CN 109758624 B CN109758624 B CN 109758624B
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Abstract
The invention discloses a high-reliability negative pressure regulator, which comprises: a valve body; the diaphragm type automatic compensation negative pressure adjusting mechanism is arranged in the valve body for negative pressure setting and negative pressure induction; the negative pressure adjusting knob is arranged on the valve body and drives the diaphragm type automatic compensation negative pressure adjusting mechanism; and a negative pressure indicator for indicating a negative pressure value according to the rotating position of the negative pressure adjusting knob is arranged between the negative pressure adjusting knob and the valve body. The negative pressure regulator provided by the invention realizes the function of a negative pressure indicator by using the position and the scale of the negative pressure adjusting knob; meanwhile, the diaphragm type automatic compensation negative pressure adjusting mechanism is adopted to serve as a negative pressure setting device and a negative pressure sensing device, and the adjusting precision and the adjusting reliability are effectively guaranteed.
Description
Technical Field
The invention relates to a pressure adjusting technology, in particular to a negative pressure regulator.
Background
In the field of medical clinical treatment, the current commonly used method for discharging sewage or removing body fluid adopts a negative pressure suction method. With the continuous update of medical equipment, the electric negative pressure suction apparatus has been gradually phased, and the wall type negative pressure suction apparatus has been widely used throughout the country due to the convenience of application and no occupation of ground space. The wall type negative pressure aspirator is a regulating device which carries out negative pressure and flow control on a negative pressure air source in a terminal through a pressure stabilizing regulating mechanism, and then forms an aspirating system with a liquid collecting bottle for clinical liquid aspirating use, so that the wall type negative pressure aspirator can meet the use of negative pressure aspirating of general medical clinical (respiratory tract, oral cavity and operation).
The structure of the present negative pressure regulator mainly comprises a flow channel integrated matrix, a switch knob, a vacuum meter, a voltage stabilizer and other parts, and the structure principle is shown in figure 1. The negative pressure source is led in by the negative pressure source connector, the change-over switch is switched to the opening position, the U-shaped groove at the bottom of the switch knob conducts a negative pressure source flow channel with a flow channel of an upper parent body center hole of the installation pressure regulator, and the output negative pressure value is adjusted by plugging the air inlet end and using the pressure regulator. The lower side of the pressure regulator is a channel leading to the output threaded port of the negative pressure regulator, the negative pressure meter and the air supplementing hole flow channel are communicated with the air inlet end flow channel and are used for displaying the negative pressure value of the negative pressure regulator at the air inlet end, and the air supplementing hole is used for guiding external air into the air inlet end of the regulator and is matched with the regulator to finish negative pressure regulation.
The cost of the negative pressure regulator formed by the method is nearly 1/3 for a common negative pressure gauge, and the cost of the vacuum micro-pressure gauge is 1/2 of the equipment cost. The elastic sensitive element of the pressure gauge is affected by vibration and external force, which affects the accuracy and return difference, the maintenance and replacement cost is very high, and the volume of the negative pressure gauge dial and the spring tube is large, which results in large overall size and poor appearance of the negative pressure regulator.
In order to ensure the safety of patients and not hurt the patients, the output negative pressure value is clinically required to be high. Especially in operation application fields such as similar larynx and thorax, too high negative pressure can cause irreversible injury for the patient, and because of the rotatory random of pressure regulating knob is great, easy maloperation leads to the negative pressure value too big in the twinkling of an eye, and the risk is higher, and the security is relatively poor.
Disclosure of Invention
In view of the problems of the existing negative pressure regulator, a new negative pressure regulator solution is needed.
Therefore, the invention aims to provide a high-reliability negative pressure regulator which does not use a negative pressure meter and has stable and reliable performance.
In order to achieve the above object, the present invention provides a high reliability negative pressure regulator, comprising:
a valve body;
the diaphragm type automatic compensation negative pressure adjusting mechanism is arranged in the valve body for negative pressure setting and negative pressure induction;
the negative pressure adjusting knob is arranged on the valve body and drives the diaphragm type automatic compensation negative pressure adjusting mechanism; and a negative pressure indicator for indicating a negative pressure value according to the rotating position of the negative pressure adjusting knob is arranged between the negative pressure adjusting knob and the valve body.
Furthermore, the diaphragm type automatic compensation negative pressure adjusting mechanism comprises an adjusting shaft, an adjusting sleeve, a pressure adjusting spring, a diaphragm assembly and a valve rod, wherein the adjusting shaft is connected with the negative pressure adjusting knob and can rotate along with the negative pressure adjusting knob; the adjusting sleeve is in threaded connection with the adjusting shaft and is matched with a limiting mechanism for preventing the adjusting sleeve from rotating, and the rotating of the adjusting shaft can drive the adjusting sleeve to do linear motion; one end of the valve rod penetrates through the adjusting sleeve, and the other end of the valve rod can be matched with a valve port on the valve body through a sealing ring to form sealing; the pressure regulating spring is sleeved on the valve rod and positioned between the valve rod and the regulating sleeve, two ends of the pressure regulating spring are respectively abutted against one end of the valve rod and the regulating sleeve and are in a prepressing state, when the regulating sleeve moves linearly, the compression amount of the pressure regulating spring can be continuously changed, and the force acting on the valve rod is also continuously changed; the diaphragm assembly is arranged on the valve rod and is in sealing fit with the valve cavity on the valve body;
the adjusting shaft rotates along with the negative pressure adjusting knob to drive the adjusting sleeve to do linear motion, when the adjusting sleeve does linear motion, the compression amount of the pressure adjusting spring is adjusted, then the valve rod can drive the diaphragm assembly to move relative to the valve cavity, and the equivalent stress area of the diaphragm in the diaphragm assembly and the valve port area on the valve body are changed in the moving process.
Furthermore, the negative pressure indicator is composed of a negative pressure scale value and an indicating mark which are arranged between the negative pressure adjusting knob and the valve body.
Furthermore, the diaphragm in the diaphragm assembly is a revolving body with a central hole and is provided with an annular bulge and a groove.
Furthermore, a direct valve group is arranged in the negative pressure regulator, and an input end flow passage and an output end flow passage on the valve body are directly communicated without passing through the valve cavity.
Furthermore, the straight-through valve group comprises a connecting cavity which is arranged on the valve body and is used for communicating the input end runner with the output end runner, a straight-through adjusting valve rod which is arranged in the connecting cavity, a return spring and a button, wherein the straight-through adjusting valve rod is a column body with threads, one end of the straight-through adjusting valve rod is provided with external threads, the other end of the straight-through adjusting valve rod is provided with a groove for installing an O-shaped sealing ring, and a straight-line opening wrench position is arranged; the button is in threaded connection with the straight-through adjusting valve rod, a sealing ring is arranged on the button, the reset spring is sleeved on the straight-through adjusting valve rod, and two ends of the reset spring are respectively abutted against the step in the valve body connecting cavity and the button; the button is matched with the reset spring to drive the straight-through adjusting valve rod to move in the connecting cavity, and meanwhile, the O-shaped sealing ring on the straight-through adjusting valve rod plays a limiting role, so that the input end flow passage and the output end flow passage are separated, and parts such as the valve rod, the button and the like are prevented from being separated from the valve body.
Furthermore, a limiting component for limiting the over rotation of the negative pressure adjusting knob is further arranged in the negative pressure adjuster.
The negative pressure regulator provided by the invention realizes the function of a negative pressure indicator by using the position and the scale of the negative pressure regulating knob; meanwhile, the diaphragm type automatic compensation negative pressure adjusting mechanism is adopted to serve as a negative pressure setting device and a negative pressure sensing device, and adjusting precision and reliability are effectively guaranteed.
Meanwhile, the negative pressure regulator provided by the invention has the advantages of better performance stability, lower manufacturing cost and higher product safety.
Drawings
The invention is further described below in conjunction with the appended drawings and the detailed description.
FIG. 1 is a schematic diagram of a conventional negative pressure regulator;
FIG. 2 is a schematic view of a negative pressure indicator in an embodiment of the present invention;
FIG. 3 is a schematic diagram of a negative pressure regulator in accordance with an embodiment of the present invention;
FIG. 4 is an exploded schematic view of a negative pressure regulator in an embodiment of the present invention;
FIG. 5 is a schematic diagram of the stem stress in the negative pressure regulator of an embodiment of the present invention;
FIG. 6 is a schematic diagram of a direct-pass mode on state of the negative pressure regulator in accordance with an embodiment of the present invention;
FIG. 7 is a diagram illustrating an OFF state of a direct-current mode of a negative pressure regulator in accordance with an embodiment of the present invention.
Detailed Description
In order to make the technical means, the creation characteristics, the achievement purposes and the effects of the invention easy to understand, the invention is further explained below by combining the specific drawings.
The negative pressure regulator provided in this example does not use a negative pressure gauge, but the negative pressure output value must be displayed and monitored on the principle that the medical instrument is safe and effective. In the structure of the negative pressure regulator provided by the embodiment, the function of the negative pressure indicator is realized by using the position and the scale of the negative pressure regulating knob.
Meanwhile, in the structure of the negative pressure regulator provided by the embodiment, the diaphragm type automatic compensation negative pressure regulating mechanism is utilized, a required negative pressure scale value is set on the outer plate surface of the regulating knob according to requirements, an indicating arrow is arranged on the valve body, and the indicating position of the knob is locked after verification, so that the negative pressure setting precision is equal to the negative pressure meter testing precision.
Moreover, the diaphragm type automatic compensation negative pressure adjusting mechanism in the negative pressure regulator structure provided by the embodiment serves as a negative pressure setting device and also serves as a negative pressure sensing device, so that the output negative pressure value can be directly set through the corresponding relation between the scale value on the knob and the arrow on the valve body.
Referring to fig. 3 and 4, there is shown an example of the structure of a negative pressure regulator according to the present embodiment based on the above-described principle.
As can be seen from the figure, the negative pressure regulator mainly comprises a knob (1), a front cover (2), a regulating shaft (3), a regulating sleeve (4), a pressure regulating spring (5), a valve cover (6), a diaphragm (7), a valve body (8), a button (9), a valve rod (10), a front valve rod (11), a diaphragm baffle plate (12), a rear valve rod (13), an opening gasket (14) and a dial (15) which are matched with one another.
The knob (1) is a multi-step columnar body with an inner hole, the outer contour of the multi-step columnar body is designed on the basis of ergonomics, three threaded holes are uniformly distributed on the circumference, and a counter bore is formed in one side of the inner part of the multi-step columnar body while a square mortise is formed in the other side of the inner part of the multi-step columnar body and communicated with the through hole.
The front cover (2) is a cuboid with a rotary cavity, the interior of the front cover is in a hollow cover shape, the top of the front cover is provided with a groove, a threaded hole is formed in the groove, a boss and a through hole are formed in the center of the groove, and four threaded holes in the bottom surface are used for positioning.
The adjusting shaft (3) is a cylindrical body with a rotating cavity, the large end of the adjusting shaft is provided with an external thread, the small end of the adjusting shaft is provided with a square tongue-and-groove, one end of the adjusting shaft is a counter bore, and the center of the adjusting shaft penetrates through the threaded hole.
The adjusting sleeve (4) is a revolving body with a step inner cavity, one end of the adjusting sleeve is provided with an internal thread, the other end of the adjusting sleeve is provided with a step hole, and the adjusting sleeve is provided with a radial threaded hole penetrating through the ring.
The pressure regulating spring (5) is a standard cylindrical spring.
Valve gap (6) is the cuboid of taking the step inner chamber, and the position at four angles all has the through-hole, and its both sides are circular boss, and inside is the shoulder hole, has two recesses on the central round hole.
The diaphragm (7) is a revolving body with a central hole and is provided with annular bulges and grooves.
The valve body (8) is a cuboid with a stepped inner cavity, four corners of the lower end face are all provided with through holes, four faces of the upper portion are all provided with holes, the rest except a counter bore are provided with screw holes, the inner portion is provided with stepped holes, a central inner hole is communicated with a radial hole of the upper portion, the top end is not communicated, and an annular inner cavity and small holes are also communicated with the air outlet.
The button (9) is a cylindrical body with internal threads, one side of the large end is provided with a concave structure, the ergonomic design is met, and one side of the small end is provided with a groove for installing an O-shaped sealing ring (20) and a threaded hole.
The valve rod (10) is a column body with screw threads, one end of the valve rod is provided with external screw threads, the other end of the valve rod is provided with a groove for installing an O-shaped sealing ring (22), and a straight-line opening wrench position is arranged.
The front valve rod (11) is a hexahedral cylinder with threads, one end of the hexahedral cylinder is a hexagonal wrench position, the head of the hexahedral cylinder is provided with a groove for installing an O-shaped sealing ring (23), and the other end of the hexahedral cylinder is provided with external threads.
The diaphragm baffle (12) is a revolving body with a central hole, and the top part is provided with an annular boss.
The rear valve rod (13) is a column body with a threaded hole, one side of the large end of the rear valve rod is provided with a groove, and one side of the small end of the rear valve rod is provided with a threaded hole.
The open washer (14) is an annular body with a rectangular cross section, and one side of the open washer is provided with an open slot.
The dial (15) is a revolving body with a groove inside, one side of the big end is provided with a boss, the bottom of the big end is provided with a groove, one side of the small end is provided with a groove and a conical surface, and the center of the small end is a through hole.
When the assembly with the structure is used for forming the negative pressure regulator, the knob (1) is fixed with a tenon with an internal thread at one end of the regulating shaft (3) through the mortise through the screw (16), and the regulating shaft is driven to rotate through rotating the knob.
The big end of the adjusting shaft (3) is in threaded connection with the adjusting sleeve (4), the inner hexagonal socket head cap screw (19) is fixed on the adjusting sleeve, and the inner hexagonal socket head cap screw and the groove of the valve cover (6) form a limiting mechanism to prevent the adjusting sleeve from rotating. Therefore, the rotation of the adjusting shaft can drive the adjusting sleeve to do linear motion.
One end of the pressure regulating spring (5) is supported on the rear valve rod (13), the other side of the pressure regulating spring abuts against the step of the regulating sleeve (4), when the regulating sleeve moves linearly, the compression amount of the spring can be changed continuously, and the force acting on the rear valve rod can also be changed continuously.
The rear valve rod (13) is in threaded connection with the front valve rod (11), the diaphragm pressing plate (24), the diaphragm (7) and the diaphragm baffle plate (12) are clamped and fixed, the front valve rod is sealed with the end face of the diaphragm baffle plate, and the head of the front valve rod is sealed with the valve body (8) through an O-shaped sealing ring (23). A steel wire check ring (25) and an opening gasket (14) are sequentially placed in a groove on one side of the large end of the rear valve rod, damping is increased in a mode of increasing friction force, and the vibration phenomenon of the adjusting valve can be basically eliminated.
The small end boss of the dial (15) is matched with the groove of the knob (1) and fixed through three set screws (17), and meanwhile, one side of the small end boss of the dial is provided with the groove and the conical surface, so that the set effect of the screws is more effective, and the knob and the dial are rotated together. The bottom of the dial is provided with a groove, and the dial and a screw (18) arranged on the front cover (2) form a limiting structure, so that the knob and the dial can only rotate 3/4 circles, and medical staff misoperation and medical accidents caused by overhigh negative pressure value setting in the treatment process are effectively prevented.
The button (9) is in threaded connection with the valve rod (10), an O-shaped sealing ring (20) is arranged in a button groove, and an O-shaped sealing ring (22) is arranged in a valve rod groove, so that gas leakage is prevented. The button receives the ascending effort of reset spring (21), drives the valve rod and forms the trend of upward movement, and O shape circle (22) has played limiting displacement simultaneously, separates valve business turn over gas port, also prevents parts such as valve rod and button and deviate from valve body (8).
The diaphragm type automatic compensation negative pressure adjusting mechanism of the negative pressure regulator is mainly used for completing automatic compensation negative pressure adjustment by adjusting stress on a valve rod formed by connecting a rear valve rod (13) and a front valve rod (11).
Referring to FIG. 5, a force diagram on the valve stem in the negative pressure regulator of the present example is shown.
As can be seen, the return spring force:
fs ═ k · x (k is the stiffness coefficient and x is the amount of length change);
force of atmospheric pressure on the diaphragm:
F0＝P0·A2 (A2is the equivalent force area of the diaphragm, P0Absolute pressure);
force of intake pressure on valve stem:
F1＝P1·A1 (A1is the area of the valve port, P1Absolute pressure);
acting force of the air outlet pressure on the diaphragm:
F2＝P2·(A2-A1) (A2is the equivalent force area of the diaphragm, A1Is the area of the valve port, P2Absolute pressure);
assuming that the frictional resistance is neglected, the force balance equation is:
F0＝Fs+F1+F2 ——(1)
namely: f2＝F0-Fs-F1 ——(2)
Substituting parameters into formula (2)
Namely: p2·(A2-A1)＝P0·A2-k·x-P1·A1 ——(3)；
Finishing to obtain: p2＝(P0·A2-k·x-P1·A1)/(A2-A1)。
Since the atmospheric pressure and the intake pressure can be considered to be constant under the same condition, i.e. P0，P1The rigidity coefficient k of the spring is unchanged after the spring is selected, and the rigidity coefficient k can be determined according to the formula (3), and the valve port area A mainly influences the change of the outlet pressure1And the equivalent stressed area A of the diaphragm2And a spring length change x.
In the structure of the back negative pressure regulator, the regulating shaft (3) is driven to rotate by rotating the knob (1), so as to drive the regulating sleeve (4) to do linear motion, thereby causing the change of the compression amount x of the spring (5) and properly increasing the area A of the diaphragm 2Reducing the valve port area A1Pressure of gas discharge P2The stability of the composition is improved.
When the negative pressure suction valve is used, a negative pressure source is connected into equipment from the side face of the valve body (8), gas enters the annular cavity Qf3 through the flow channels Qf5 and Qf4 in sequence, negative pressure suction is completed through Qf2 and Qf1, the flow channel Qf6 communicated with the flow channel Qf5 at the air inlet end is an air supply hole, the air supply hole is matched with a negative pressure suction device to perform negative pressure adjustment, in addition, the excessive negative pressure value in a failure mode is prevented, and the safety and the reliability of medical equipment are ensured.
Referring to fig. 2, the dial (15) panel in the negative pressure regulator is marked with the required negative pressure scale value, the valve body (8) is provided with an indicating arrow, the dial indicating position is locked with the knob (1) by using a set screw (17) after being verified, the synchronous rotation of the knob and the dial is ensured, and the negative pressure setting precision is equivalent to the testing precision of a negative pressure meter, so that the output negative pressure value can be set by directly corresponding the scale value on the knob and the arrow on the valve body.
The negative pressure regulator does not use a negative pressure meter, realizes the function of the negative pressure indicator by using the position and the scale of the negative pressure adjusting knob, can realize the pressure adjusting range by setting different spring stiffness, and adopts the specification of 0-70 mmHg in the example shown in figure 2. The knob of the regulator can only rotate 3/4 circles, so that misoperation of medical staff is effectively prevented, medical accidents caused by overhigh negative pressure value in the treatment process are avoided, meanwhile, a straight-through function is added, the input end flow passage and the output end flow passage of the valve can be quickly communicated, and clinical emergency requirements are met.
Moreover, the negative pressure regulator is also provided with a quick switch, and in the operation process, the input end flow passage Qf1 and the output end flow passage Qf5 of the valve can be quickly conducted to form a direct connection function (as shown in fig. 6) only by pressing the button (9) and overcoming the elastic force action of the spring (21).
When the button is released, the button drives the valve rod (10) to reset under the action of the elastic force of the reset spring, and the input end flow passage Qf1 and the output end flow passage Qf5 are quickly separated (as shown in fig. 7).
The foregoing shows and describes the general principles, principal features, and advantages of the invention. It will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, which are given by way of illustration of the principles of the present invention, but that various changes and modifications may be made without departing from the spirit and scope of the invention, and such changes and modifications are within the scope of the invention as claimed. The scope of the invention is defined by the appended claims and equivalents thereof.
Claims (5)
1. High reliability negative pressure regulator, its characterized in that includes:
a valve body;
the diaphragm type automatic compensation negative pressure adjusting mechanism is arranged in the valve body to perform negative pressure setting and negative pressure induction, and is matched with the valve body to form a ring cavity (Qf 3);
The negative pressure adjusting knob is arranged on the valve body and drives the diaphragm type automatic compensation negative pressure adjusting mechanism; a negative pressure indicator for indicating a negative pressure value according to the rotation position of the negative pressure adjusting knob is arranged between the negative pressure adjusting knob and the valve body;
the direct valve group is arranged in the valve body, an input end flow passage (Qf 1) and an output end flow passage (Qf 5) are formed on the direct valve group, a first flow passage (Qf 2) and a second flow passage (Qf 4) are arranged on the valve body, the second flow passage (Qf 4) is communicated with the output end flow passage (Qf 5) and an annular cavity (Qf 3) in the diaphragm type automatic compensation negative pressure adjusting mechanism, and the first flow passage (Qf 2) is communicated with the input end flow passage (Qf 1) and the annular cavity (Qf 3) in the diaphragm type automatic compensation negative pressure adjusting mechanism; an air supplementing hole runner (Qf 6) is formed on the through valve group, the air supplementing hole runner (Qf 6) is communicated with an output end runner (Qf 5), and a negative pressure aspirator is matched for negative pressure adjustment; the straight-through valve group comprises a connecting cavity which is arranged on the valve body and is used for communicating an input end flow passage and an output end flow passage, and a straight-through adjusting valve rod, a return spring and a button which are arranged in the connecting cavity, wherein the straight-through adjusting valve rod is a column body with threads, one end of the straight-through adjusting valve rod is provided with external threads, the other end of the straight-through adjusting valve rod is provided with a groove for installing an O-shaped sealing ring, and the straight-through adjusting valve rod is provided with a straight-line opening spanner position; the button is in threaded connection with the straight-through adjusting valve rod, a sealing ring is arranged on the button, the reset spring is sleeved on the straight-through adjusting valve rod, and two ends of the reset spring are respectively abutted against the step in the valve body connecting cavity and the button; the button is matched with the return spring to drive the straight-through adjusting valve rod to move in the connecting cavity, and the O-shaped sealing ring on the straight-through adjusting valve rod plays a limiting role at the same time, so that an input end flow passage is separated from an output end flow passage, and the straight-through adjusting valve rod and the button are prevented from being separated from the valve body;
The negative pressure regulator is characterized in that a negative pressure source is connected into the equipment through the valve body, gas sequentially enters an annular cavity (Qf 3) in the diaphragm type automatic compensation negative pressure regulating mechanism through an output end flow passage (Qf 5) and a second flow passage (Qf 4) on the valve body, negative pressure suction is completed through a first flow passage (Qf 2) on the valve body and an input end flow passage (Qf 1), and the diaphragm type automatic compensation negative pressure regulating mechanism completes automatic compensation negative pressure regulation; the input end runner and the output end runner on the valve body in the negative pressure regulator can be directly communicated without passing through the valve cavity.
2. The high-reliability negative pressure regulator according to claim 1, wherein the diaphragm type automatic compensation negative pressure regulating mechanism comprises a regulating shaft, a regulating sleeve, a pressure regulating spring, a diaphragm assembly and a valve rod, and the regulating shaft is connected with a negative pressure regulating knob and can rotate along with the negative pressure regulating knob; the adjusting sleeve is in threaded connection with the adjusting shaft and is matched with a limiting mechanism for preventing the adjusting sleeve from rotating, and the rotating of the adjusting shaft can drive the adjusting sleeve to do linear motion; one end of the valve rod penetrates through the adjusting sleeve, and the other end of the valve rod can be matched with a valve port on the valve body through a sealing ring to form sealing; the pressure regulating spring is sleeved on the valve rod and positioned between the valve rod and the regulating sleeve, two ends of the pressure regulating spring are respectively abutted against one end of the valve rod and the regulating sleeve and are in a prepressing state, when the regulating sleeve moves linearly, the compression amount of the pressure regulating spring can be continuously changed, and the force acting on the valve rod is also continuously changed; the diaphragm assembly is arranged on the valve rod and is in sealing fit with the valve cavity on the valve body;
The adjusting shaft rotates along with the negative pressure adjusting knob to drive the adjusting sleeve to do linear motion, when the adjusting sleeve does linear motion, the compression amount of the pressure adjusting spring is adjusted, then the valve rod drives the membrane assembly to move relative to the valve cavity, and the equivalent stress area of the membrane in the membrane assembly and the area of the valve port on the valve body are changed in the moving process.
3. The high reliability negative pressure regulator of claim 1, wherein the negative pressure indicator is comprised of a negative pressure scale value and an indication mark provided between the negative pressure adjustment knob and the valve body.
4. The high reliability negative pressure regulator of claim 2, wherein the diaphragm of the diaphragm assembly is a solid of revolution with a central bore and with annular lands and grooves.
5. The high reliability negative pressure regulator of claim 1, wherein a limit component is further disposed in the negative pressure regulator to limit over-rotation of the negative pressure regulating knob.
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| CN201811647313.0A CN109758624B (en) | 2018-12-30 | 2018-12-30 | High-reliability negative pressure regulator |
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| CN201811647313.0A CN109758624B (en) | 2018-12-30 | 2018-12-30 | High-reliability negative pressure regulator |
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| CN112983874B (en) * | 2021-03-15 | 2022-04-12 | 蒋亮健 | Hand regulating type mark swing angle regulator for electric fan |
| CN115554486A (en) * | 2022-07-25 | 2023-01-03 | 开封市第二中医院 | Clinical drainage equipment that uses of emergency intensive care unit |
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| CN100398890C (en) * | 2006-04-17 | 2008-07-02 | 清华大学 | Powerless mechanical feedback type automatic adjustment valve of air-feed flow |
| CN201539611U (en) * | 2009-10-20 | 2010-08-04 | 张亚东 | Visual adjusting automatic water replenishing valve |
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|---|---|---|---|---|
| CN2262147Y (en) * | 1995-12-09 | 1997-09-10 | 中外合资浙江新益空压机有限公司 | Pressure reducing valve |
| CN101990655A (en) * | 2007-04-20 | 2011-03-23 | 费希尔控制产品国际有限公司 | Integral overpressure monitoring device |
| CN202972068U (en) * | 2012-11-27 | 2013-06-05 | 凯迈（洛阳）气源有限公司 | Oxygen pressure reducer |
| CN207437916U (en) * | 2017-11-23 | 2018-06-01 | 新疆回水环保新材料有限公司 | A kind of steam autocontrol valve for semi-coke raw material |
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